from datetime import datetime, timedelta
import time

from django.views.decorators.csrf import csrf_exempt
from django.shortcuts import render_to_response, get_object_or_404
from django.core.urlresolvers import reverse
from django.http import HttpResponseRedirect, HttpResponse, Http404
from django.template import RequestContext
from django.utils.translation import ugettext as _
from django.utils import simplejson
from django.db import models

from forum.http_responses import HttpResponseUnauthorized
from forum.settings.base import Setting
from forum.forms import MaintenanceModeForm, PageForm, CreateUserForm
from forum.settings.forms import SettingsSetForm
from forum.utils import pagination, html
from forum.utils.mail import send_template_email
from forum.models import Question, Answer, User, Node, Action, Page, NodeState, Tag
from forum.models.node import NodeMetaClass
from forum.actions import NewPageAction, EditPageAction, PublishAction, DeleteAction, UserJoinsAction, CloseAction
from forum import settings

TOOLS = {}

def super_user_required(fn):
    def wrapper(request, *args, **kwargs):
        if request.user.is_authenticated() and request.user.is_superuser:
            return fn(request, *args, **kwargs)
        else:
            return HttpResponseUnauthorized(request)

    return wrapper

def staff_user_required(fn):
    def wrapper(request, *args, **kwargs):
        if request.user.is_authenticated() and (request.user.is_staff or request.user.is_superuser):
            return fn(request, *args, **kwargs)
        else:
            return HttpResponseUnauthorized(request)

    return wrapper

def admin_page_wrapper(fn, request, *args, **kwargs):
    res = fn(request, *args, **kwargs)
    if isinstance(res, HttpResponse):
        return res

    template, context = res
    context['basetemplate'] = settings.DJSTYLE_ADMIN_INTERFACE and "osqaadmin/djstyle_base.html" or "osqaadmin/base.html"
    context['allsets'] = Setting.sets
    context['othersets'] = sorted(
            [s for s in Setting.sets.values() if not s.name in
            ('basic', 'users', 'email', 'paths', 'extkeys', 'repgain', 'minrep', 'voting', 'accept', 'badges', 'about', 'faq', 'sidebar',
            'form', 'moderation', 'css', 'headandfoot', 'head', 'view', 'urls')]
            , lambda s1, s2: s1.weight - s2.weight)

    context['tools'] = [(name, fn.label) for name, fn in TOOLS.items()]

    # Show the navigation only to moderators and super users
    if not context.has_key("hide_navigation"):
        context['hide_navigation'] = not request.user.is_superuser

    unsaved = request.session.get('previewing_settings', {})
    context['unsaved'] = set([getattr(settings, s).set.name for s in unsaved.keys() if hasattr(settings, s)])

    return render_to_response(template, context, context_instance=RequestContext(request))

def admin_page(fn):
    @super_user_required
    def wrapper(request, *args, **kwargs):
        return admin_page_wrapper(fn, request, *args, **kwargs)

    return wrapper

def moderation_page(fn):
    @staff_user_required
    def wrapper(request, *args, **kwargs):
        return admin_page_wrapper(fn, request, *args, **kwargs)

    return wrapper

def admin_tools_page(name, label):    
    def decorator(fn):
        fn = admin_page(fn)
        fn.label = label
        TOOLS[name] = fn

        return fn
    return decorator

class ActivityPaginatorContext(pagination.PaginatorContext):
    def __init__(self):
        super (ActivityPaginatorContext, self).__init__('ADMIN_RECENT_ACTIVITY', pagesizes=(20, 40, 80), default_pagesize=40)

@admin_page
def dashboard(request):
    return ('osqaadmin/dashboard.html', pagination.paginated(request, ("recent_activity", ActivityPaginatorContext()), {
    'settings_pack': unicode(settings.SETTINGS_PACK),
    'statistics': get_statistics(),
    'recent_activity': get_recent_activity(),
    'flagged_posts': get_flagged_posts(),
    }))

@super_user_required
def interface_switch(request):
    if request.GET and request.GET.get('to', None) and request.GET['to'] in ('default', 'djstyle'):
        settings.DJSTYLE_ADMIN_INTERFACE.set_value(request.GET['to'] == 'djstyle')

    return HttpResponseRedirect(reverse('admin_index'))

@admin_page
def statistics(request):
    today = datetime.now()
    last_month = today - timedelta(days=30)

    last_month_questions = Question.objects.filter_state(deleted=False).filter(added_at__gt=last_month
                                                                               ).order_by('added_at').values_list(
            'added_at', flat=True)

    last_month_n_questions = Question.objects.filter_state(deleted=False).filter(added_at__lt=last_month).count()
    qgraph_data = simplejson.dumps([
    (time.mktime(d.timetuple()) * 1000, i + last_month_n_questions)
    for i, d in enumerate(last_month_questions)
    ])

    last_month_users = User.objects.filter(date_joined__gt=last_month
                                           ).order_by('date_joined').values_list('date_joined', flat=True)

    last_month_n_users = User.objects.filter(date_joined__lt=last_month).count()

    ugraph_data = simplejson.dumps([
    (time.mktime(d.timetuple()) * 1000, i + last_month_n_users)
    for i, d in enumerate(last_month_users)
    ])

    return 'osqaadmin/statistics.html', {
    'graphs': [
            {
            'id': 'questions_graph',
            'caption': _("Questions Graph"),
            'data': qgraph_data
            }, {
            'id': 'userss_graph',
            'caption': _("Users Graph"),
            'data': ugraph_data
            }
            ]
    }

@admin_page
def tools_page(request, name):
    if not name in TOOLS:
        raise Http404

    return TOOLS[name](request)


@admin_page
def settings_set(request, set_name):
    set = Setting.sets.get(set_name, {})
    current_preview = request.session.get('previewing_settings', {})

    if set is None:
        raise Http404

    if request.POST:
        form = SettingsSetForm(set, data=request.POST, files=request.FILES)

        if form.is_valid():
            if 'preview' in request.POST:
                current_preview.update(form.cleaned_data)
                request.session['previewing_settings'] = current_preview

                return HttpResponseRedirect(reverse('index'))
            else:
                for s in set:
                    current_preview.pop(s.name, None)

                request.session['previewing_settings'] = current_preview

                if not 'reset' in request.POST:
                    form.save()
                    request.user.message_set.create(message=_("'%s' settings saved succesfully") % set_name)

                    if set_name in ('minrep', 'badges', 'repgain'):
                        settings.SETTINGS_PACK.set_value("custom")

                return HttpResponseRedirect(reverse('admin_set', args=[set_name]))
    else:
        form = SettingsSetForm(set, unsaved=current_preview)

    return 'osqaadmin/set.html', {
    'form': form,
    'markdown': set.markdown,
    }

@super_user_required
def get_default(request, set_name, var_name):
    set = Setting.sets.get(set_name, None)
    if set is None: raise Http404

    setting = dict([(s.name, s) for s in set]).get(var_name, None)
    if setting is None: raise Http404

    setting.to_default()

    if request.is_ajax():
        return HttpResponse(setting.default)
    else:
        return HttpResponseRedirect(reverse('admin_set', kwargs={'set_name': set_name}))


def get_recent_activity():
    return Action.objects.order_by('-action_date')

def get_flagged_posts():
    return Action.objects.filter(canceled=False, action_type="flag").order_by('-action_date')[0:30]

def get_statistics():
    return {
    'total_users': User.objects.all().count(),
    'users_last_24': User.objects.filter(date_joined__gt=(datetime.now() - timedelta(days=1))).count(),
    'total_questions': Question.objects.filter_state(deleted=False).count(),
    'questions_last_24': Question.objects.filter_state(deleted=False).filter(
            added_at__gt=(datetime.now() - timedelta(days=1))).count(),
    'total_answers': Answer.objects.filter_state(deleted=False).count(),
    'answers_last_24': Answer.objects.filter_state(deleted=False).filter(
            added_at__gt=(datetime.now() - timedelta(days=1))).count(),
    }

@super_user_required
def go_bootstrap(request):
#todo: this is the quick and dirty way of implementing a bootstrap mode
    try:
        from forum_modules.default_badges import settings as dbsets
        dbsets.POPULAR_QUESTION_VIEWS.set_value(100)
        dbsets.NOTABLE_QUESTION_VIEWS.set_value(200)
        dbsets.FAMOUS_QUESTION_VIEWS.set_value(300)
        dbsets.NICE_ANSWER_VOTES_UP.set_value(2)
        dbsets.NICE_QUESTION_VOTES_UP.set_value(2)
        dbsets.GOOD_ANSWER_VOTES_UP.set_value(4)
        dbsets.GOOD_QUESTION_VOTES_UP.set_value(4)
        dbsets.GREAT_ANSWER_VOTES_UP.set_value(8)
        dbsets.GREAT_QUESTION_VOTES_UP.set_value(8)
        dbsets.FAVORITE_QUESTION_FAVS.set_value(1)
        dbsets.STELLAR_QUESTION_FAVS.set_value(3)
        dbsets.DISCIPLINED_MIN_SCORE.set_value(3)
        dbsets.PEER_PRESSURE_MAX_SCORE.set_value(-3)
        dbsets.CIVIC_DUTY_VOTES.set_value(15)
        dbsets.PUNDIT_COMMENT_COUNT.set_value(10)
        dbsets.SELF_LEARNER_UP_VOTES.set_value(2)
        dbsets.STRUNK_AND_WHITE_EDITS.set_value(10)
        dbsets.ENLIGHTENED_UP_VOTES.set_value(2)
        dbsets.GURU_UP_VOTES.set_value(4)
        dbsets.NECROMANCER_UP_VOTES.set_value(2)
        dbsets.NECROMANCER_DIF_DAYS.set_value(30)
        dbsets.TAXONOMIST_USE_COUNT.set_value(5)
    except:
        pass

    settings.REP_TO_VOTE_UP.set_value(0)
    settings.REP_TO_VOTE_DOWN.set_value(15)
    settings.REP_TO_FLAG.set_value(15)
    settings.REP_TO_COMMENT.set_value(0)
    settings.REP_TO_LIKE_COMMENT.set_value(0)
    settings.REP_TO_UPLOAD.set_value(0)
    settings.REP_TO_CREATE_TAGS.set_value(0)
    settings.REP_TO_CLOSE_OWN.set_value(60)
    settings.REP_TO_REOPEN_OWN.set_value(120)
    settings.REP_TO_RETAG.set_value(150)
    settings.REP_TO_EDIT_WIKI.set_value(200)
    settings.REP_TO_EDIT_OTHERS.set_value(400)
    settings.REP_TO_CLOSE_OTHERS.set_value(600)
    settings.REP_TO_DELETE_COMMENTS.set_value(400)
    settings.REP_TO_VIEW_FLAGS.set_value(30)

    settings.INITIAL_REP.set_value(1)
    settings.MAX_REP_BY_UPVOTE_DAY.set_value(300)
    settings.REP_GAIN_BY_UPVOTED.set_value(15)
    settings.REP_LOST_BY_DOWNVOTED.set_value(1)
    settings.REP_LOST_BY_DOWNVOTING.set_value(0)
    settings.REP_GAIN_BY_ACCEPTED.set_value(25)
    settings.REP_GAIN_BY_ACCEPTING.set_value(5)
    settings.REP_LOST_BY_FLAGGED.set_value(2)
    settings.REP_LOST_BY_FLAGGED_3_TIMES.set_value(30)
    settings.REP_LOST_BY_FLAGGED_5_TIMES.set_value(100)

    settings.SETTINGS_PACK.set_value("bootstrap")

    request.user.message_set.create(message=_('Bootstrap mode enabled'))
    return HttpResponseRedirect(reverse('admin_index'))

@super_user_required
def go_defaults(request):
    for setting in Setting.sets['badges']:
        setting.to_default()
    for setting in Setting.sets['minrep']:
        setting.to_default()
    for setting in Setting.sets['repgain']:
        setting.to_default()

    settings.SETTINGS_PACK.set_value("default")

    request.user.message_set.create(message=_('All values reverted to defaults'))
    return HttpResponseRedirect(reverse('admin_index'))


@super_user_required
def recalculate_denormalized(request):
    for n in Node.objects.all():
        n = n.leaf
        n.score = n.votes.aggregate(score=models.Sum('value'))['score']
        if not n.score: n.score = 0
        n.save()

    for u in User.objects.all():
        u.reputation = u.reputes.aggregate(reputation=models.Sum('value'))['reputation']
        u.save()

    request.user.message_set.create(message=_('All values recalculated'))
    return HttpResponseRedirect(reverse('admin_index'))

@admin_page
def maintenance(request):
    if request.POST:
        if 'close' in request.POST or 'adjust' in request.POST:
            form = MaintenanceModeForm(request.POST)

            if form.is_valid():
                settings.MAINTAINANCE_MODE.set_value({
                'allow_ips': form.cleaned_data['ips'],
                'message': form.cleaned_data['message']})

                if 'close' in request.POST:
                    message = _('Maintenance mode enabled')
                else:
                    message = _('Settings adjusted')

                request.user.message_set.create(message=message)

                return HttpResponseRedirect(reverse('admin_maintenance'))
        elif 'open' in request.POST:
            settings.MAINTAINANCE_MODE.set_value(None)
            request.user.message_set.create(message=_("Your site is now running normally"))
            return HttpResponseRedirect(reverse('admin_maintenance'))
    else:
        form = MaintenanceModeForm(initial={'ips': request.META['REMOTE_ADDR'],
                                            'message': _('Currently down for maintenance. We\'ll be back soon')})

    return ('osqaadmin/maintenance.html', {'form': form, 'in_maintenance': settings.MAINTAINANCE_MODE.value is not None
                                           })


@moderation_page
def flagged_posts(request):
    return ('osqaadmin/flagged_posts.html', {
    'flagged_posts': get_flagged_posts(),
    })

@admin_page
def static_pages(request):
    pages = Page.objects.all()

    return ('osqaadmin/static_pages.html', {
    'pages': pages,
    })

@admin_page
def edit_page(request, id=None):
    if id:
        page = get_object_or_404(Page, id=id)
    else:
        page = None

    if request.POST:
        form = PageForm(page, request.POST)

        if form.is_valid():
            if form.has_changed():
                if not page:
                    page = NewPageAction(user=request.user, ip=request.META['REMOTE_ADDR']).save(data=form.cleaned_data
                                                                                                 ).node
                else:
                    EditPageAction(user=request.user, node=page, ip=request.META['REMOTE_ADDR']).save(
                            data=form.cleaned_data)

            if ('publish' in request.POST) and (not page.published):
                PublishAction(user=request.user, node=page, ip=request.META['REMOTE_ADDR']).save()
            elif ('unpublish' in request.POST) and page.published:
                page.nstate.published.cancel(ip=request.META['REMOTE_ADDR'])

            return HttpResponseRedirect(reverse('admin_edit_page', kwargs={'id': page.id}))

    else:
        form = PageForm(page)

    if page:
        published = page.published
    else:
        published = False

    return ('osqaadmin/edit_page.html', {
    'page': page,
    'form': form,
    'published': published
    })

@admin_page
def delete_page(request, id=None):
    page = get_object_or_404(Page, id=id)
    page.delete()
    return HttpResponseRedirect(reverse('admin_static_pages'))

@admin_tools_page(_('createuser'), _("Create new user"))
def create_user(request):
    if request.POST:
        form = CreateUserForm(request.POST)

        if form.is_valid():
            user_ = User(username=form.cleaned_data['username'], email=form.cleaned_data['email'])
            user_.set_password(form.cleaned_data['password1'])

            if not form.cleaned_data.get('validate_email', False):
                user_.email_isvalid = True

            user_.save()
            UserJoinsAction(user=user_).save()

            request.user.message_set.create(message=_("New user created sucessfully. %s.") % html.hyperlink(
                    user_.get_profile_url(), _("See %s profile") % user_.username, target="_blank"))

            return HttpResponseRedirect(reverse("admin_tools", kwargs={'name': 'createuser'}))
    else:
        form = CreateUserForm()

    return ('osqaadmin/createuser.html', {
        'form': form,
    })

class NodeManagementPaginatorContext(pagination.PaginatorContext):
    def __init__(self, id='QUESTIONS_LIST', prefix='', default_pagesize=100):
        super (NodeManagementPaginatorContext, self).__init__(id, sort_methods=(
            (_('added_at'), pagination.SimpleSort(_('added_at'), '-added_at', "")),
            (_('added_at_asc'), pagination.SimpleSort(_('added_at_asc'), 'added_at', "")),
            (_('author'), pagination.SimpleSort(_('author'), '-author__username', "")),
            (_('author_asc'), pagination.SimpleSort(_('author_asc'), 'author__username', "")),
            (_('score'), pagination.SimpleSort(_('score'), '-score', "")),
            (_('score_asc'), pagination.SimpleSort(_('score_asc'), 'score', "")),
            (_('act_at'), pagination.SimpleSort(_('act_at'), '-last_activity_at', "")),
            (_('act_at_asc'), pagination.SimpleSort(_('act_at_asc'), 'last_activity_at', "")),
            (_('act_by'), pagination.SimpleSort(_('act_by'), '-last_activity_by__username', "")),
            (_('act_by_asc'), pagination.SimpleSort(_('act_by_asc'), 'last_activity_by__username', "")),
        ), pagesizes=(default_pagesize,), force_sort='added_at', default_pagesize=default_pagesize, prefix=prefix)

@admin_tools_page(_("nodeman"), _("Bulk management"))
def node_management(request):
    if request.POST:
        params = pagination.generate_uri(request.GET, ('page',))

        if "save_filter" in request.POST:
            filter_name = request.POST.get('filter_name', _('filter'))
            params = pagination.generate_uri(request.GET, ('page',))
            current_filters = settings.NODE_MAN_FILTERS.value
            current_filters.append((filter_name, params))
            settings.NODE_MAN_FILTERS.set_value(current_filters)

        elif r"execute" in request.POST:
            selected_nodes = request.POST.getlist('_selected_node')

            if selected_nodes and request.POST.get('action', None):
                action = str(request.POST['action'])
                selected_nodes = Node.objects.filter(id__in=selected_nodes)

                message = _("No action performed")

                if action == 'delete_selected':
                    for node in selected_nodes:
                        if node.node_type in ('question', 'answer', 'comment') and (not node.nis.deleted):
                            DeleteAction(user=request.user, node=node, ip=request.META['REMOTE_ADDR']).save()

                    message = _("All selected nodes marked as deleted")

                if action == 'undelete_selected':
                    for node in selected_nodes:
                        if node.node_type in ('question', 'answer', 'comment') and (node.nis.deleted):
                            node.nstate.deleted.cancel(ip=request.META['REMOTE_ADDR'])

                    message = _("All selected nodes undeleted")

                if action == "close_selected":
                    for node in selected_nodes:
                        if node.node_type == "question" and (not node.nis.closed):
                            CloseAction(node=node.leaf, user=request.user, extra=_("bulk close"), ip=request.META['REMOTE_ADDR']).save()

                    message = _("Selected questions were closed")

                if action == "hard_delete_selected":
                    ids = [n.id for n in selected_nodes]

                    for id in ids:
                        try:
                            node = Node.objects.get(id=id)
                            node.delete()
                        except:
                            pass

                    message = _("All selected nodes deleted")

                request.user.message_set.create(message=message)

                params = pagination.generate_uri(request.GET, ('page',))
                
            return HttpResponseRedirect(reverse("admin_tools", kwargs={'name': 'nodeman'}) + "?" + params)


    nodes = Node.objects.all()

    text = request.GET.get('text', '')
    text_in = request.GET.get('text_in', 'body')

    authors = request.GET.getlist('authors')
    tags = request.GET.getlist('tags')

    type_filter = request.GET.getlist('node_type')
    state_filter = request.GET.getlist('state_type')
    state_filter_type = request.GET.get('state_filter_type', 'any')

    if type_filter:
        nodes = nodes.filter(node_type__in=type_filter)

    state_types = NodeState.objects.filter(node__in=nodes).values_list('state_type', flat=True).distinct('state_type')
    state_filter = [s for s in state_filter if s in state_types]

    if state_filter:
        if state_filter_type == 'all':
            nodes = nodes.all_states(*state_filter)
        else:
            nodes = nodes.any_state(*state_filter)

    if (authors):
        nodes = nodes.filter(author__id__in=authors)
        authors = User.objects.filter(id__in=authors)

    if (tags):
        nodes = nodes.filter(tags__id__in=tags)
        tags = Tag.objects.filter(id__in=tags)

    if text:
        text_in = request.GET.get('text_in', 'body')
        filter = None

        if text_in == 'title' or text_in == 'both':
            filter = models.Q(title__icontains=text)

        if text_in == 'body' or text_in == 'both':
            sec_filter = models.Q(body__icontains=text)
            if filter:
                filter = filter | sec_filter
            else:
                filter = sec_filter

        if filter:
            nodes = nodes.filter(filter)

    node_types = [(k, n.friendly_name) for k, n in NodeMetaClass.types.items()]

    return ('osqaadmin/nodeman.html', pagination.paginated(request, ("nodes", NodeManagementPaginatorContext()), {
    'nodes': nodes,
    'text': text,
    'text_in': text_in,
    'type_filter': type_filter,
    'state_filter': state_filter,
    'state_filter_type': state_filter_type,
    'node_types': node_types,
    'state_types': state_types,
    'authors': authors,
    'tags': tags,
    'hide_navigation': True
    }))

@csrf_exempt
@super_user_required
def test_email_settings(request):
    user = request.user

    send_template_email([user,], 'osqaadmin/mail_test.html', { 'user' : user })

    return render_to_response(
        'osqaadmin/test_email_settings.html',
        { 'user': user, },
        RequestContext(request)
    )